Specifically, the report explores the relationship between TIF and property values at the local and regional level using economic data from all Wisconsin municipalities between 1990 and 2006. Economic, statistical modeling provides an estimate of the average impact of TIF on property values in a way that might be useful for local officials in making economic development decisions.

The report’s key findings:

* TIF Growth. TIF utilization in Wisconsin municipalities has grown considerably (400%) since 1990, especially in the southern and central areas of the state. More than one quarter of the municipalities using TIF are now over the statutory TIF value limit.

* Who Uses TIF? Medium-sized municipalities (under 50,000 residents) and those with growing property tax bases are using TIF more often than those with lower rates of property value growth, including Wisconsin’s biggest cities. Although TIF was originally intended to spur economic development in struggling areas, TIF is being used more frequently by communities that are experiencing economic growth.

* TIF Benefits. TIF has the potential to be a useful economic development tool for villages and cities in redeveloping “blighted” properties and raising property values. On average, for every $1 increase of TIF value, total property value is estimated to increase by $6.

* Differences Across Communities. Differences in TIF use exist between Wisconsin’s largest metropolitan cities and outlying municipalities. On average, outlying localities are at risk of over-utilizing TIF. Statistical modeling estimates that if the average Wisconsin suburb were to increase its TIF amount by 10% (keeping all other factors constant), then its total property value would likely decrease by 0.2%. Meanwhile, Wisconsin’s largest cities appear to under-utilize TIF: the model indicates that a 10% increase in TIF value would likely increase property values by 2%.

* Regional TIF Effects. Within Wisconsin’s metropolitan regions, greater TIF investment in suburban communities may impair property value growth in the corresponding central city (i.e. Wisconsin’s largest cities). According to the model, a 10% increase in suburban increment value would likely result in an estimated 1.1% decrease in central city property value.

Overall, using historical data to model estimated TIF impacts suggests that excessive TIF use has the potential to negatively impact the economies of individual communities as well as Wisconsin’s largest cities. In other words, excessive TIF use (especially in outlying municipalities) may potentially create a scenario in which property value growth in the state is impaired.

At the same time, TIF can be a successful tool in redeveloping areas in Wisconsin’s largest cities. The model suggests that these cities (those over 50,000 residents) have not utilized TIF at the ideal rate to maximize property values.

Local and state officials are encouraged to look at TIF in a way that asks whether their communities are using TIF “Too Much or Not Enough.”